<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=], initial-scale=1.0">
    <title>Document</title>
  <style>
    .box{
        border: 100px   solid #111;
        width: 0px;
        height: 0px;
        background-color: red;
        

    }
  </style>
</head>
<body>
    <div class="box">

    </div>
</body>
</html>